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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef1412b0da4f88cae52e3a8ae9c65ae282e903888a73d64c8c928199adf49f25' 
  AND token = 'hkfTT05gU0ERYE05D1bgO8SYOR48Mk5OuuruFgBCk9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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