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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24899ab4622c20d941dd4fb76a655381354f649e8494c2be4556c2e8ffdfc6c3' 
  AND token = '7ue79969slYJ57ATTjyUHd8CQhG8cbzNV0cpBqSmmAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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