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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84c759471e46312c9b56a97d0820af1d18adc49925c1b9308dc34aefba22aaae' 
  AND token = 'NTW4imYzNFMwXzsfneSQfQfxmREJ82u3ByZ62ZiWEFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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