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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df369875b254781a337cc5ccadd0969864403abec095a7aed386faa584a49b51' 
  AND token = 'iQba6f1guPMrafyRt/koiT3tHxs6Lqb2Iu4xTiNGC+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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