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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfb56f2e17a528b0b95ba8646d53cda4415d006ab8b689d60f2d6b41626e7102' 
  AND token = 'aUB2TmZk4o3dc/mMwk5z7eSs8YWibOp2edgcS06M0yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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