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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fe04c9a6aa20abb4290bb5a7e02decbe6500e1af0e7b2f91cda117d08f05572' 
  AND token = 'PKtkSmEJFIgFbCBmEnkhSQMzjFbxRtMo67BP6h2dTgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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