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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2bb8d3508fa27207ecaff1edd496d10e5129ef4c831609b704021a8d56cca61' 
  AND token = 'JK17ln2oH0DwA0C26PT3HahInR5gnd9oTmYVFXv95fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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