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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58877edb2c9dddf3773a775337631e76231594a8151d766852d39b65fb92865a' 
  AND token = 'P8aqxTEbGXqX6stV9T4iEfaLREwqWAsDvGi7wJasjig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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