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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '913afde12468b6e50ad4cd16c9b62fe5532740adf7421a6c517699381a1e304a' 
  AND token = 'CtiOUj2TtdazvCsNQp5bUD6sUdVqPpIN/i12pU7jsEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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