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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e22f0153a8f42556ba96e5bca408542f0c936fe0fc040c663112aae55dc8832' 
  AND token = 'eg2v/gRV12WqRS5s5BNcsM89O1G3GlobcBORCB/1W2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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