SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8df06b9fed0f840bea859dc57a12a7c363806de20ac96a2a99750f3f35cc5c1d' 
  AND token = 'K29Fl1E+ZbWI0kYhUxBiqc4Fv8hh70Kv/+HYUMje014=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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