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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f5bda543c767bb0f426fe48366b8db3c4c9a6d1b4c30af28aff97b028daaa76' 
  AND token = 'aKBjvi3fPq4UYWmd/j90NdaqDJUe/tsxAonFRIOkNU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}