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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '698f04173f95e55b5ec25337077ec72ebdcf1a22bcd6fc14aad709bfb0e3d178' 
  AND token = 'nsnDmKzsWFDvw8cVN2txf1zJd3f5CpfLAmduBqqAtec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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