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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2489a9a6e3125463a39ea365bb68c3f46bafc0296cab5aba9d62f6f62673fb16' 
  AND token = 'R9ckjzPLVp65RzAJWosIWqdmXGJslRuT4/WAYo3bXuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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