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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e49527ecbc49149aae5feb2b5ec9a5b7fdc0832ea8f8f0c77b151b0720b047b' 
  AND token = 'hNvkSBI7+Rx5tIMTgUTz9BsrFrXVyeT39rlW9TkCpg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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