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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '141a34f6ebfecb26a43de542be2a2ed6af88b2ff03325b19bba211501f3906f5' 
  AND token = 'W9h5RPJDQ+urRnuw+tPHsJ7yBb8aC6DbcIVVE/n6joQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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