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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78a7f9b528e474e2c4b6c6a3d70e5a08e56d76a5c3e9e74dba44ab4af36f17b2' 
  AND token = 'Z4ZrSRnIjm6AwoaCA0SBysj8CDWNp1NkUjoT5HFRaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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