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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '006a7b09a03ea6adf0b9f3a9481001922c975ab02e00e6acad57ba3c72956b88' 
  AND token = 'DdOAkNUHvPxYrW6utzAfrVV8K79fMTZ6umLvnt2H1qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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