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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ad324bd40c5cce8d43d34852dc17f158d99720da09aa06c948870603555592' 
  AND token = '88x5dpWRWtucgo6lgR6avyvQkmw7gbhuRuRKiizd450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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