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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a345adc98193e9ec1d12ff7deee439d5e511b9cb20677b504d8efe6d4662dcc7' 
  AND token = 'xwPVLHfnJd1LHBMdgjf/evfi6F6Kq6FLyAqsdsK0P4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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