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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f610a8654762dcbf969d36848ab910639eb7a6a216e164008b9588e57c43c984' 
  AND token = 'DueRsfKySwSX7T82ty8yJuDZS3mbhH9Ad2amkox+fEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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