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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52d2bd0482edc96df391fe38d565bd98964c06f8b4e4bf81d8b59ee185999cdd' 
  AND token = '85qpXsWNBk5BV1L6p+9HH41bX9bEE21PUih/hr+Rwrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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