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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50d677adc86024a5a4ac5908fe099ba9cade709622bac5245a29de2cb62e50bf' 
  AND token = 'HnR73fmk5WfjLvewk7L0fWhmfodFdbIhDwGfs63XuDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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