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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '803b744bf62342f82901fc227563ef8d964c2e767caadf41623434c150b2ac31' 
  AND token = '1cN5O/+5eyqA9Tx7OtiXOcBSqaPiGKPe4q2pUEoMCfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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