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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '550f9f99eab70fbf60c1b675b5edcd7aef18b7e9385f8f68af21b09fdbccce90' 
  AND token = 'FGr4N0NBAp5NtPMkr4TQFn0cSMSvrfoNzay/qZ/ynsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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