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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a00e1f4ebf567b85ba88ddb07b810bdd16d6510489794d4d5ec5fc87b877a95' 
  AND token = 'JvMCFb/njXweS264n9l5sXB6x4ztMEJhia6s+74VdZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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