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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd43d1dbc36ade4b74692a5649d5e4b4bcb0bfd29bd37a35d6b16b90a4fae2345' 
  AND token = 'XZTe9rFuuT8owRpUk881wG3oPl/8bN7gdVIZ5PPkzT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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