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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37588ad7b70c9dd68419741d064963f804af016f38a10e6d2735027eb02f35af' 
  AND token = '5iB3aWi/CWNuJAUyYi0ElWeKBXrk4HOsw/koY/kyFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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