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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3e37710f2e95ee8c0ee1d104c235c922e05a0f8f3aa29557de37704f2342b7' 
  AND token = 'qwnhNlyKTcEa8r+acXvHWjG6Zr+T293QWIkxg+nden8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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