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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e0c731f81bc4e8fe333ef5e724509d83d8a41d77f2a4a026745a6610dedd218' 
  AND token = '3F6lUaVY1VizZ2SUnSAyX3Cfiwcxfcm1kOiP7enlgdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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