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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9283e037e36596bfde0ab318af5918244e7cd2f5a24feb0b5f427f09aadf4ac' 
  AND token = 'g74RMcR1vCKnvawXPReZbTM95H5Z/kCi3dzvHtxZE5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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