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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5956c40e6255ebf1472b9e500a485806140ddc8f770554d8c25dc94d54543d6' 
  AND token = 'sKjSEgQGt6VEZxZFauZPSe4kGh1Cp3yok70x0kBDDxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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