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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a77af6432949f4b1445621fb6ca5f8e34a43fb4c3d7a066ae1575c6d16cf449' 
  AND token = 'fvWWLZx0NnIDVNaNq9D2m18Fwr8QRm36T/eJMN4zp0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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