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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '365c39213fe21a130c3044bdef97f253e234662cfb8bd82f893ef56deaa7305a' 
  AND token = '4zyooKKWuSeuraeJ7dk9CQx77RQw4vJMHzQYgARXyLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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