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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '415d361bff162e2bd48eed22fdcbc206bc67510f0870415865e8cb3b53595225' 
  AND token = 'e3HunajEAxm8qxtZVndGAUBlnH1L3SEaFWbe/U8Xmr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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