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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd94e494f15c66944efc18e2e5a7ea6e964f14df7764d2b16a553d287bff5c334' 
  AND token = '9bVEcTTjpPxgMl2bPU4PaN+qk2mtwvQMOykaRnuKl4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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