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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9717c578f67eb5d5f042011f85ad1b5575eabca2cce944b893c32e3f580f7967' 
  AND token = 'BAYgYIGSiTF7eZCVbfTDl8VId6+upcPAfv9ro9pbshM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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