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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c86c88b9dba630b79129f43a25a3d6d0be4a1a7936f35e902dc80afaf821013' 
  AND token = 'IzaTe2SaAQ4VAh30pX1pBU9FsZYWKwP1fFlzlThPAxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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