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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed71cf80393444669751cb7bce6c63c9be3d16f37a4ff66e9973003db3e6d0c3' 
  AND token = 'yTVxGwm/0nNrWyj/g/x3Fl2qBzBmHcPAcQP/CM3iM+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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