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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47e621a44f6f14ea31d2cee11e9cdd94de3f8841bcff7fb10e58733dd1ff7f2c' 
  AND token = 'j9ai2YO83EPcTF2IyYU6CiHftrTD7ts0C8wNSz72/cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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