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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99a3c802299236fef2b1cc3aeba1f7423b97747891cdb5cf092b594e03c0b2b3' 
  AND token = 'e7MWHGtHMIgB0l5dBysC4iEX7v+3Iii6JlR00/DJCk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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