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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da93098c758535a796771b7f2b76f38d37f935b0538b63fec54b7ccdb7170d2' 
  AND token = 'bxSBvGoEuT5ctaWS1KD1ypwoqll7JsbJMs8j3ryMz2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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