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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3913f28e3b982a7832f39dac39d0cc4f634ad988c1264f082d9a26fdb9549c3' 
  AND token = 'vjrBj474GuSqUZRIst57MkgH2nlWw3elamUT97rRxzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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