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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ff081ee567ba3f672555d36eee594f38e9ff107b3f274e7499311d0d73981e9' 
  AND token = 'QDy9tbesg4jUT3lj7yLKmrNwSj968ndUQ9DlI0YF+qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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