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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3fe7d1758fff6309ff006c90a994fed97a94fd138ca933d92d81bd526efa1f' 
  AND token = 'FcoQYLOBPdVO3eua0dlN/XGCUEWV3ZdIlwNn+2YC7lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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