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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d6df603a76c2dcfa6c012741095cb6b11bcd12024da395b9bbea75920f28543' 
  AND token = 'P1FQf8taF8Y18LDWfNZndpraAnww9w4h55wEcIvNNzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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