SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '535b7eff0ec1a5aaa9ee36fa74f24828f47c4e6425a3a967f63469d2aff7243c' 
  AND token = '4uQ11uEH+O9yFFGu326GgkqBQ8wK8G4bVXPvjRkF+t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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