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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cb7214d17f64bfba17e045e9990b2b38394e9df51549fcb5847f0f3b361b115' 
  AND token = 'VQ88eaRAMcFjaPZWNVce/+A9BlyE3Hbpp/L82Ect9Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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