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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0915fdab8c04b5718c8fc3cbb96883ae1a4ec4b919f185d2e41590af6194a56' 
  AND token = 'o4gvOOUWHvBxj2XL9Wdb3jESrMlqYWu69LcmK6XckIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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