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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4177a3c30313537bed48735da584242b3291d2995e8c6d3e9600063e54c637b1' 
  AND token = '0w/Yt2Ihs7rszdou8ExtAPM9jc7qef0aOi0Dgodt8Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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