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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84c4e361b011f8372af73f77c761471bfced0d358dc45b981d4a66348f755bb1' 
  AND token = 'fTBsIuJsrCX3UVhJLt0FBUDGSFJtjH44WEVlJcAk5AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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