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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f7511e24539b363f7314f5733448c2476d0a8efa62d487b71312439a609fc4e' 
  AND token = 'Mt1VTru31i7jOCgusFwCwQgoo8IRLN15pVVTE/QJSL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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