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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68f95fac157ed43e8a71be1e30e278541157442dfc89b5b330b43450d8b66d05' 
  AND token = 'xcwLNcYx5Ys1xjjFPg9lS/Pf5nrGc8wD6PEkY43Zm7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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