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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2caab56b3a70221855d4ddb3e70936fde69eefae0fbdf241d2b29f2bf275af78' 
  AND token = 'HfhBCSq7fq5FGrp5rY0qrYUuRCeJAuUB/aoWnCetOUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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