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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e7d7a69e1c203a2cd8c6386b65b279ed4e9fb17f0fc1ad422c9153b9bab9001' 
  AND token = '5D3gTdXYbd5a7ymkrK8KOAmqddHBFYUbkJaLoIVmti4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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