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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca323c2d9687633d00c346c718014a9c42eecd8ddc15d7cf8bb02398ed62cfad' 
  AND token = 'LvyEsE5xTc40CbM8NkaIHSwFRlDl7mP3AKjyr1N7T6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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