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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7b2c1682a7bc9de8d89cacc8de4c58b85d2eff7dd3b8c3d9e8cc3db2dcba82c' 
  AND token = 'pSOO7MCKtdTe48+4jtNOyHEAhPeOs1NtcujX8cW+9aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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