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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '239de26bc1da804ae9acae1e1be999ef7a8c5184629a6003d1146d9f558b9a51' 
  AND token = 'U4ah00bsojgFfxGYcIKBZXdsmKyWC0p3CW0nwaFJftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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