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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '874774593730c914ffc817d4cff4a8accdfe021ec9aa53c2fd1c81e468e6ec2e' 
  AND token = 'bihe4Uvk5+YqDrPVyLF7BqXhVxSFfAFGoQW4PklIT7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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