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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73205df0d07c6b2a8954c7b15a159daac8f325730730151483951e3d2c62c33d' 
  AND token = 'dcxJ3azt150ru42179VKE5IKP38S5pnfI8VcE35/qlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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