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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1fafe95620e498008cc16adec1e1897297bc955d07b54264b390d5c13ab54ac' 
  AND token = 'M9qs9azQVTjOGzKfI6NO4P1Ryh3DsLRXu49c+so2oIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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